Patent US3921992A successfully refreshed from Google Patents.
US3921992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Seals notably for rotary shafts
Assignee: Paulstra SNC
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Filing: 1974-12-05
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Granted: 1975-11-25
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Expires: 1994-12-05
Abstract
Abstract A seal for a rotary shaft comprises a diaphragm of elastomer in the shape of a portion of a cupola, connected through its large base to a rigid armature and ending, on the side of its small base, in at least one sealing lip designed to contact the shaft. The profile of the concavity of the inner face of the cupola is continuous up to the contact edge of the lip so that the angle of incidence of the inner profile with the axis of the shaft, at the location of said edge, has a value, at least before mounting, of at least 35*.
Inventors
- 👤 Jacques Bertin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:46
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/32; F16J15/3204; F16J15/3208
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
116 words
Seal, notably for a rotary shaft, said seal comprising a diaphragm of elastomer in the shape of a portion of a cupola or the like, connected through its large base to a rigid armature and ending, on the side of its small base, in at least one sealing lip designed to come into contact with the shaft or the like, the profile of the concavity of the inner face of the cupola being kept continuous up to the contact edge of the lip so that the angle of incidence of the inner profile with the axis of the shaft, at the location of said edge, has a value, at least before mounting, of at least 35*.
Claim 2
Dependent Claim
116 words
Seal, notably for a rotary shaft, said seal comprising a diaphragm of elastomer in the shape of a portion of a cupola or the like, connected through its large base to a rigid armature and ending, on the side of its small base, in at least one sealing lip designed to come into contact with the shaft or the like, the profile of the concavity of the inner face of the cupola being kept continuous up to the contact edge of the lip so that the angle of incidence of the inner profile with the axis of the shaft, at the location of said edge, has a value, at least before mounting, of at least 35*.
Claim 3
Dependent Claim
28 words
Seal according to claim 1, wherein the inner profile of the diaphragm is of circular formation, with its center positioned before or beyond the axis of the shaft.
Claim 4
Dependent Claim
25 words
Seal according to claim 1, wherein the inner profile of the diaphragm is a circle, with its center positioned on the axis of the shaft.
Claim 5
Dependent Claim
51 words
Seal according to claim 1, wherein the inner profile of the diagphragm has a tapered form, with a radius of curvature diminishing as it recedes from the side of the contact edge of the lip, so as to enable the angle of incidence at the contact with the shaft to increase.
Claim 6
Dependent Claim
35 words
Seal according to claim 1, wherein the angle of the profile with the axis of the shaft, at the location of the edge, is at least before mounting, of the order of 35* to 45*.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |